The combustion characteristics of various torrefied biomass was investigated using an experimental combustion furnace under isothermal and non-isothermal conditions. The biomass used in this study were food waste and sewage sludge. The compositions of emission gases from the combustion of biomass samples were analyzed and compared with those of SRF (solid refuse fuel). From isothermal combustion experiments, it was found that the CO and HCl emission from the combustions of SRF was higher compared to the food waste and sewage sludge. It was also found that the NOx concentration of the emission gas from the combustion of SRF was the lowest while it was highest for the food waste. From non-isothermal combustion experiments, while observing the CO2 emission, the combustion of food waste occurred earlier compared to the sewage sludge and SRF.